Try to answer these questions on Unix:

1.what will be the segment() function do?
2.How Unix is more powerful than Windows?
3.Where ownership details will be stored of a particular file in Unix?
4.State different uses of ^ symbol in regular expressions.
5.What does export command used for?
6.Diff. between ordinary file & directory in terms of Unix file system.
7.Different Uses of set command.
8.What is the file .profile used for?
9.Write command to display : Friday,May 21,2006
10.Write grep command to select lines which start with capital letters.
11.How can u create hidden file?How can u see a list of hidden files?
12.What permissions a directory & its parent directory must have when u want to modify a file?
13.Use of $(string)?
14.How will u create a subshell?How will u move to parent shell after creating subshell?
15.what grep '^//*' tmpfile look for?
16.what does command grep "$SHELL$"/etc/passwd|cut -d:f1 do?
17.Write expr command to extract last 2 character of variable x.
18.Which command can be alternativel yused to achieve the purpose of run level 0?.Diff. between run level 1,2,3.
19.How device files are similar to ordinary files?which command is used to create a device file?
20.What type of linked list is used by kernel to maintain a free list of buffer?
21.What will happen when value of sem_op; whixh is no. of sembuf structure, is +ve?
22.While creating shared memory region, which system call is useful to specify its size?
23.Write a command to display only filenames of regular files having read & execute permission for user?
24.What does a shell process will do when we hit enter key after typing a command to be run?
25.What is back reference in sed?
26.Explain any 2 hold space command by giving example in sed.